Event risk before this expiration:FOMC decision Wed, Oct 28 · Jobs report Fri, Nov 6 · CPI release Tue, Nov 10 · Jobs report Fri, Dec 4 · FOMC decision Wed, Dec 9 · CPI release Thu, Dec 10 — macro releases historically overwhelm pinning effects; max pain reads weakest in event weeks.
■ put-side pain■ call-side painTotal payout option writers would owe at each settle price (both sides, all open interest, ×100 shares) — low settles hurt put writers, high settles hurt call writers. The minimum — 172 — is the max pain price.
Open interest by strike · Fri, Dec 18
■ calls (up)■ puts (down)IUSG open contracts per strike for Fri, Dec 18.
Open-interest change: building vs unwinding
Needs two observed snapshot days for this expiration; the comparison appears automatically once the next weekday snapshot lands. We diff real observations only; nothing is estimated.
Volume by strike · Fri, Dec 18
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Dec 18
— call IV— put IVATM ≈ 24.2% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Dec 18
Net dealer gamma per strike, in dollars per 1% move, assuming the standard convention (dealers long calls, short puts) — an assumption, not an observation. Above the amber flip level hedging tends to dampen moves; below it, to amplify them.
Greeks by strike · Fri, Dec 18
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.98
-0.02
115
0.0009
0.03
-0.02
-0.02
0.98
-0.02
120
0.0011
0.04
-0.02
-0.02
0.93
-0.04
150
0.0046
0.10
-0.04
-0.07
0.81
-0.05
170
0.0124
0.20
-0.05
-0.19
0.79
-0.05
172
0.0137
0.21
-0.06
-0.21
0.78
-0.06
173
0.0144
0.22
-0.06
-0.23
0.69
-0.06
179
0.0189
0.26
-0.06
-0.32
0.67
-0.06
180
0.0197
0.26
-0.06
-0.33
0.23
-0.04
200
0.0196
0.22
-0.05
-0.81
0.15
-0.03
205
0.0150
0.17
-0.04
-0.89
0.11
-0.03
210
0.0111
0.14
-0.03
-0.94
0.06
-0.02
220
0.0062
0.09
-0.01
-0.99
0.03
-0.01
235
0.0029
0.05
—
-1.00
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Δ per $1 of underlying · Θ per day · vega per IV point.
Stacked — layer the expirations
Call open interest per strike, stacked across the checked expirations — each color is one expiry. Strikes are pruned to the liquid center of each chain.
Max pain is arithmetic, not prophecy: the settle price that would minimize what option writers pay out at expiration, computed from open interest alone. Prices sometimes gravitate toward heavy strikes into expiry — dealer hedging is a real flow — but the evidence that max pain predicts settlement better than chance is mixed, and we are not going to pretend otherwise. Use it as a map of where positioning is stacked, next to the fundamentals and the earnings calendar, not as a target.
Data: Cboe delayed public feed (~15 minutes), refreshed here about every 15 minutes. Open interest itself updates once daily, before the open. Educational information, not investment advice.